As a good teacher,   he should use different ways to encourage all children to realize their full________

and achieve their goals. [ ]

A. possibility  

B. conception

C. potential  

D. difference

以下关于信用证的种类的说法错误的是：

A．有可撤销信用证和不可撤销信用证之分，未加注明的视为不可撤销信用证

B．有保兑信用证和不保兑信用证之分，保兑是指一家银行开出的信用证由另一家银行保证付款

C．有可转让信用证和不可转让信用证之分，未加注明的为可转让信用证

D．有即期信用证和远期信用证之分